This is the elephant in the room, right? Everybody likes to have sex as often as possible, biological limitations not withstanding. There are plenty of ways to address the issue of sex, but no matter how you're going to handle it, you have to talk about it. Some couples employ a don't ask don't tell policy while they're separated. Many couples aren't down with that, and decide to get by with phone sex, erotic Skype sessions, and marathon sexcapades on those rare moments when they are together. There is no right or wrong answer as long as you're honest with yourself. Just don't agree to something you aren't comfortable with and then get angry when things play out exactly as you and your partner decides they would.